/Engine/Plugins/Runtime/OptionalMobileFeaturesBPLibrary/Source/OptionalMobileFeaturesBPLibrary/Classes/OptionalMobileFeaturesBPLibrary.h
Returns the current volume state of the device in a range of 0-100 (%)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Mobile") static int GetVolumeState()